Vacuum-operated brake



NE om4 TR2 ses Nmi mma, um@ amm, .wm m WV Jima 9, 1925.

Patented June 9, 1925.

WILBIAM O. KENNINGTON, OF LQNDON, ENGLAND.

VACUUM-*OPERATED BRAKE;

Application filed November 5, 1924. Serial No. 747,917.

To Z7 'wilma t may concern? lle, it known that I, TILLIAM Oscan Kme MNo'roN, a British subject, residing at 'lhe llyde, Hendon, London, N. lV. 9, llngland. have invented a new and useful Improved Vacuiini-Operated- Brake, of which the followingv is a specification.

This invention has reference to vacuum operated brakes 'for automobiles and like vehicles and is more particularly but not exclusively concerned with lvehicles of this type wherein a brake isprovided for each wheel.

AThe primary object of my invention is to provide an improved braking,r system for automobiles and-like vehicles consisting of few parts and capable of being economically mnstructed easily operated and at the saine time beine' highly cliicient in use.

'ith these ends in view and such others fis may hereinafter appear or are incidental thereto the invention in its broadest aspect inay be said to'consist in the provision of means whereby the suction of the engine is utilized to actuate the brake mechanism when the throttle valve of the engine is moved beyond what is normally the closed position.

More specilieally regarded the invention is embodied in an arrangement wherein the suction ot the engine actuates a piston bel-v loyvs or other appropriate pressure contrivunce, when the throttle valve has been moved to a position beyond whatmay be termed the normally closed position of the valve said piston or like eontrivance being then adapted to aetuate the mechanism whereby the brekcs are applied. y

In actmms: th my invention I provide that part of eine with a recess so located that when the throttle valve is in a position to restrict or interrupt the supply of combustible mixture from the Carburettor to the engine or in other words when it is in the'normally closed position the upper lip of the recess is opposite the edge ofthe throttle valve. The

aforesaid recess communicates' by means of a suitable connection such as a pipe with a suction operated device for example a piston. or bellows or 'other `like contrivanee adapted in operation to actuate thcbrake` mechanism through suitable connections vwhen the aforesaid suction device is subjected to the suction of the engine as will presently be explained.

the intake pipe of the enfl vPa'rnlvr ioFFlcE.

The throttle valve vwhich may be ofthe ordinary butterfly piston or other conven- 4ient type is mounted in the intake pipe of the engine and when fully opened permits the passage otf the maximum quantity ot' combustible mixture and when it-is desired to decelerate the engine the throttle is moved into the requisite position and whenA it is in what is normally thel closed position it restricts or prevents the passage of combustible mixture to the'engine all as is usual -in internal combustion engines of the type to which this invention refers. According to this invention in this position the throttle is at one edge of the aforesaid recess in the intake pipe and if it is now desired to apply the.v brakes the throttle is moved across the recess towards the other edge and thereby places the piston or bellows or other pressure mechanism in communication With tln` sueth i side ot' the throttle valve whereby the said pressure mechanism is gradually subjected to the. suction of the engine and `the brakes which as above stated are connected to the pressure mechanismfare applied. When the throttleis in the position just described the pressure mechanism is subjected to the iu'll suction effect of the engine and during the movement of the throttle from the normally closed position' to the extreme position the combustible mixture can leak past the recess around the edge ofthe throttle valve to the engine whereby the latter is supplied with sufticientinixture to enable it to turn over and at the same time the brakes are gradually applied.

ln order that the invention maybe clearly understood by those skilled in the art tov which it appertains reference Will now be made to the accompanying drawings which illustrate one manner of carrying theinvention into effect. v

Fig. l represents a secticii through the intake pipe of an internal combustion engine and of one form of pressure mechanism for operating the brakes in accordance with my invention and Fig. i2 isa diagrammatic view in sectional elevationof the general arrangement of parts wherein iny invention is embodied.

In the drawings wherein the same reterenee numerals indicate the sume. or simi-2 valve 2 for controlling the passage of combustible mixture to the engine the intake being provided with a recess 3. Communieating with the recess 3 by means of a pipe 4 is a pressure operated device comprising a cylinder v'ffving a piston 6 to which is secureda brake Control rod 7 adapted to be secured te thert brake mechanism whereby the bratl;- .stare applied to the wheels.

In t construction illustrated I have shown a". ring 8 for the purpose of assisting in returning the rod 7 when the suction of the engine on the piston 6 is released to the inoperative position thereby bringing the brake mechanism to the ofi position'.

. The rear side of the piston 6 maybe open to atmosphere hut should serious leakage ot' 10 1n:"ur-ted on a spindle 11 and' having anv air past the piston occur .it might conceivably detrimentally ailect the composition of the combustible mixture when the parts lare in position to apply the brakes. I may therefore, provide a pipe connection f) between the intake pipe 1 on the carburettor side of the -throttle valve 2.and the rear ot the piston 6 sothat any leakage past the latter will be leakage of normally rich mixture.

In operation when it is desired to deee1erate the throttle is moved into the normally closed position shown in Fig. 1 in which position it restricts or prevents the passage of combustible mixture to the engine. If now it is desired to apply the brakes the throttle is-'moved across the recess 3 whereby the piston 6 is gradually subjected to the engine suction and the brakes applied. During this movement of the throttle the combustible mixture can leak` around the edge of the throttle to the engine whereby a sufficient quantity of mixture is supplied to the ,engine to enable it to run or turn over and the brakes gradually applied.' The' means whereby this is eii'ected is more clearly shown in Figure 2 the movement of` the throttle 2 being controlled by a pedal extension 12 connected by means of a rod 13 to the usual arm 14 ot the throttle valve spindle 15. When it is desired to de-celerate pressure on the pedal 10 is decreased whereupon a relatively strong spring 16 moves the throttle into the desired position. If now it is desired, to apply the brakes the pressure on the pedal 10 is still further decreased p and the spring 16 moves the throttle beyond thefnormally closed position. During this movement a clutch member 17 on the extenf stop 21.' Immediately the spring 16 begins sion 12 engages a co-operating clutch member 18 on an arm 19 mounted on spindle 11 and moves said arm 1 9 against the action of a relatively weak spring 20 which normally retains the arm 19 in contact with a to move the pedal 10 upwards` against the action of the spring 20 the driver of the provided to movethe, stop out of the path` of the pedal or lever operating the throttle.

to permit said lever and consequently the throttle being further actuated and the brakes applied. i

Itwill be understood that I may if desired provide means i'or co-ordinating my improved brake, mechanism 'with `the ordinary foot or hand brake in such a manner that :a preliminary braking may be effected by the means I have described followed` byy further braking by means of .the foot or hand brake. Means may also be provided for actuating the rod 7 by manually or pedal controlled means but as these refinements will be apparent to vthose 'skilled in the art to which this invention appertains further description thereof is here deemed unnecessary. y

While I have described one construction of arts of my`improved brake mechanism andp the operation *thereof I am aware that changes of construction and operation may be made without departing from the spirit -and scope of the invention described I may provide more than one as may he deemed advisable according to the being ap.

y for example in-, stead of one pressure devlce as shown and' CII kind of vehicle to which my invention is'to be applied and I therefore do not wish `to be understood as limiting the scope of my "claims by the positive terms employed* gn. connection with the'description, v

What I claim isz-,-

1. A vacuum operated brake mechanism for automobiles and like vehicles, comprising, the combination of the usual brake and throttlev mechanism, and means operated by the suction of the engines to actuate the brake mechanism when the throttle is moved beyond what is normally the closed position. ,v l

2'. A. vacuum operated brake mechanism for automobiles and like vehiclescomprising a pressure operated device adapted to be actuated by the suction of the engine when mechanism connectingy'said device to; the' brakes of the vehicle.

3. A vacuum operated brake mechanism -for'automo'biles and like vehicles comprislng a pressure "operated device means for f weien connectingA seid device to the' brakes of the vehicle and Ineens for movingthe throttie valve of the engixfie 'beyond the normally closed position to permit the suction of the engine to ectuate the ressure operated de vice and apply the bre es, i 4. A vacuum operated brake mechanism for automobiles and like vehicles comprising a pressure operated device mechanism cooperating therewith to apply the brakes to the Wheels of the vehicle when the seid device is actuated means whereby the throttle valve of the envine een bemoved beyond the normally closed position to permit the suetion of the engine'to actuate the pressure operated device and means whereby the engine is kept running when vthe throttle valve has been moved beyond the normally closed position. Y

5. A vacuum opereted brake mechanism for automobiles and like vehicles eomprising n pressure operated device mechanism tor connecting'I said device to the brakes of the vehicle means whereby nthe throttle valve of the engine can be moved beyond the normally closed positionmeens for establish ing communication between the suction of the engine and said device when the throttie 'valve is moved beyond the .normally 6: A vacuum operated breite mechanism. for automolnlesiend like vehicles comprising i L pressure operatedi device mechanism for connectlng said device to the breites of the vehicle means whereby the throttle vaive of the engine can be moved beyond the normelly closed position means whereby when the throttle valve is moved beyond the normaliy closed position communiczitionl is esteblished between the suction the engine and said device so 'es to ectuete seid device end apply the brakes means Wherehy combustible mixture cen leek past the throttle velve tosupply the engine with fuel when'the thottle valve has been moved beyond lthe nonv mally closed .position end means for indieating the position of the throttle' the brakes being applied.

W2 0.; KENNNGTN;

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